Programa de Pós-graduação em Ciências Veterinárias, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro - UFRRJ, Seropédica, RJ, Brasil.
Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro - UFRRJ, Seropédica, RJ, Brasil.
Rev Bras Parasitol Vet. 2022 Apr 1;31(1):e018221. doi: 10.1590/S1984-29612022018. eCollection 2022.
The inappropriate use of synthetic acaricides has selected resistant Rhipicephalus microplus populations. The present study evaluated the compatibility of different Metarhizium spp. propagules (conidia, blastospores, and microsclerotia) by incubating them with synthetic acaricides (amitraz, deltamethrin, and a combination of cypermethrin, chlorpyrifos, and citronellal) for 1 h, 5 h, 10 h, and 24 h. Conidia and microsclerotia of the tested isolates were usually more tolerant to synthetic acaricides than blastospores. Our study also analyzed the in vitro effect of deltamethrin associated with fungal propagules for controlling a population of R. microplus females that were not susceptible to this synthetic acaricide. The use of entomopathogenic fungi in association with deltamethrin in this tick population caused a greater tick control than did the use of the fungus or the synthetic acaricide separately.
不恰当地使用合成杀螨剂已经选择出了具有抗性的 Rhipicephalus microplus 种群。本研究通过将不同的绿僵菌繁殖体（分生孢子、芽生孢子和微菌核）与合成杀螨剂（咪螨胺、溴氰菊酯和氯菊酯、柠檬醛的混合物）孵育 1 h、5 h、10 h 和 24 h，评估了它们的相容性。与芽生孢子相比，测试分离物的分生孢子和微菌核通常对合成杀螨剂更具耐受性。我们的研究还分析了与真菌繁殖体相关联的溴氰菊酯对体外控制对这种合成杀螨剂不敏感的 R. microplus 雌性种群的效果。与单独使用真菌或合成杀螨剂相比，在这种蜱种群中使用昆虫病原真菌与溴氰菊酯联合使用会导致更高的蜱控制效果。
